template<typename K,typename V>
struct Dictionary   //词典Dictionary模板类
{
	virtual int size() const = 0;  //当前词条总数
	virtual bool put(K, V) = 0;  //插入词条
	virtual V* get(K k) = 0;  //读取词条
	virtual bool remove(K k) = 0;  //删除词条
};